"Mount Shasta is the present-day home of the Lemurians who survived the sinking of the continent of Lemuria over 12,000 years ago. Our Lemurian brothers and sisters are very real and live a highly evolved 5th dimensional existence within the subterranean city of “Telos” underneath the mountain.
Prior to the sinking of their continent, fully aware of the eventual destiny of their beloved continent, the ancient Lemurians, using their mastery of energy, crystals, sound and vibrations, hollowed out a vast underground city to preserve their culture, treasures and their records of ancient Earth’s history which have been lost on the surface since the sinking of Atlantis. Lemuria was once a vast continent in the Pacific Ocean"
https://www.telos-usa.com/newsletter/mount-shasta/
"Agartha, also known as Shambhala or Shangri-La, is a legendary kingdom that is said to be located inside the Hollow Earth at the Earth's core, inhabited by an ancient civilization known as the Agarthans. It is related to the belief in a Hollow Earth and is a popular subject in esotericism."
https://the-demonic-paradise.fandom.com/wiki/Agartha
"Biringan City is a mythical place filled with towering spires and cathedral-like buildings that rises from the waters up to the clouds. It is described as a very technologically-advanced metropolis where everything is jet-black, sleek, and ultramodern. Sometimes also referred to as Araw (sun) City—due to its perceived brightness or the never-ending twilight within its borders—it is said to be inhabited by unearthly beautiful and tall white beings. These inhabitants are believed to be engkantos (thue enchanted ones) or the souls of the lost and the dead."
https://exemplore.com/legends/The-Invisible-City-of-Biringan-Revealed
"Their mission is peaceful. The visitors contemplate settling on this plane.
These visitors are human-like but much larger in size.
They are not excarnate Earth people but come from their own world.
They do NOT come from a planet as we use the word, but from an etheric planet which interpenetrates with our own and is not perceptible to us.
The bodies of the visitors, and the craft, automatically materialize on entering the vibratory rate of our dense matter."
https://prepareforchange.net/2020/10/25/declassified-fbi-document-beings-from-other-dimensions-visit-earth-regularly/